High-impact resistance surface functional group treated carbon nanotube modified reactive powder concrete

Abstract

The invention discloses a high-impact resistance surface functional group treated carbon nanotube modified reactive powder concrete. The high-impact resistance surface functional group treated carbonnanotube modified reactive powder concrete is characterized in that the raw materials of the high-impact resistance surface functional group treated carbon nanotube modified reactive powder concrete comprise cement, functionalized multi-walled carbon nanotubes, silica fume, fly ash, sands, a water reducer and water; and the functionalized multi-walled carbon nanotubes are carboxylated multi-walledcarbon nanotubes or hydroxylated multi-walled carbon nanotubes. The functionalized multi-walled carbon nanotubes can significantly enhance the dynamic compressive strength, dynamic peak strain and impact toughness of the reactive powder concrete. When the strain rate is in a range of 200-800 / s and the dosage of the multi-wall carbon nanotubes is 0.25-0.5%, the dynamic compressive strength of concrete can be increased by 71.3%, the dynamic peak strain can be increased by 101. 1%, and the impact toughness can be increased by 100.8%.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a highly impact-resistant surface functional group-treated carbon nanotube-modified active powder concrete. Background technique [0002] Reactive powder concrete is a new type of ultra-high performance concrete, known for its high strength and high durability, and has been gradually used in bridges, high-rise buildings and nuclear industries. However, the fine aggregate-matrix interface characteristics of reactive powder concrete make it inevitable to expose more concrete weak areas, which reduces the overall performance of its material structure to a certain extent. In addition, the high density of reactive powder concrete often leads to the aggravation of its brittle damage. More importantly, under the high strain rate dynamic impact load, the compression time of concrete becomes shorter, the effective bearing area decreases, and the brittle failure of concrete wil...

AI Technical Summary

Problems solved by technology

However, the high price and high content of nanoparticles (1%-10% of cement quality) weakens its application prospect in practical engineering.

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